I'm pleased to announce that BMC Bioinformatics has released a paper about mSpecs (PMID 19624850). If you use mSpecs extensively in your research, my coworkers and me would be happy if you cite us with the following reference:

Thielen B, Heinen S, Schomburg D: mSpecs: a software tool for the administration and editing of mass spectral libraries in the field of metabolomics. BMC Bioinformatics. 2009 Jul 22;10:229